Add shell script for adding wlan headlessly

addwlan.sh

@@ -0,0 +1,51 @@
+#!/bin/bash
+
+# ---- configure connection - change as appropriate
+NAME=<connectionName>
+SSID=<SSID>
+PRIORITY=0
+HIDDEN=[true|false]
+PASS=<password>
+PLAIN=1
+# ---- end configure connection
+
+CONNFILE=/etc/NetworkManager/system-connections/${NAME}.nmconnection
+UUID=$(uuid -v4)
+
+if [ ! -z "${PASS}"]; then
+    if [ $PLAIN -eq 1 ]; then
+        PSK="$(wpa_passphrase ${SSID} ${PASS} | grep -T "psk" | grep -v '"' | cut -d= -f 2)"
+    else
+        PSK="${PASS}"
+    fi
+fi
+
+cat <<- EOF >${CONNFILE}
+[connection]
+id=${NAME}
+uuid=${UUID}
+type=wifi
+autoconnect-priority=${PRIORITY}
+[wifi]
+mode=infrastructure
+ssid=${SSID}
+hidden=${HIDDEN}
+[ipv4]
+dns-priority=100
+method=auto
+[ipv6]
+dns-priority=50
+addr-gen-mode=default
+method=auto
+[proxy]
+EOF
+if [ ! -z "${PASS}" ]; then
+    cat <<- EOF >>${CONNFILE}
+[wifi-security]
+key-mgmt=wpa-psk
+psk=${PSK}
+EOF
+fi
+chmod 600 ${CONNFILE}
+sed -i 's| systemd.run=/boot/firmware/addwlan.sh.*||g' /boot/firmware/cmdline.txt
+exit 0